AS 1443:2004 pdf – Carbon and carbon-manganese steel- Cold finished bars
AS 1443:2004 pdf – Carbon and carbon-manganese steel- Cold finished bars.
If. after acceptance of the stcel and provided it has been properly treated after delivery. subsequent processing reveals that it contains defects found to be detrimental, the steel shall be deemed not to comply with this Standard.
7.2 BrIght bars
7.2.1 (‘old-drawn and cold-rolled bars
The maximum permissible depth of surface imperfections shill be in accordance with the requirements for surface condition designation B Isec Appendix C).
7.2.2 TUrOL’d and polished or precision ground bars
The surface shall be free from imperfections of hot-rolled origin.
7.3 Cold-sIted or peeled bars
Thc maximum permissible depth of surface imperfections shall be in accordance with the requirements for surface conditions designated ‘commercial’ for cold-sited bars, or those designated F for peeled bars (see Appendix C).
8 DlNlISlOAL TOI.IRANCES
Steel bars shall meet the following dimensional tolerance requirements:
Is) Tolerances for cross-sectional dimensions
The tolerances for cross-sectional dimensions of round, square, hexagonal and flat bars shall be graded in accordance with Table S and shall conform to the limits given in Table 9.
(b) Tolcranccs for length
With the exception of coils, the length of all bars shall be bctween 3 m and 7 m. They
shall conform to the requirements of the mill length or the set length categories of
NOTE; Bars may be in the cropped. saw-cut or chamfered form.
Ic) Tolerances for straightness
With the exception of coils. the maximum allowable deviation from straightness shall be as follows:
(i) For commercial applications
The straightness requirements for commercial applications shall be in accordance with Table II.
(ii) For critical applications
The straightness requirements for critical applications applies to round bars less than 25 mm diameter and shall be less than 0.1 mm deviation from a straight line in 300 mm 11:3000).
I All straightness measurcinenhi. are taken a, least 50 mm from the end of the product.
2 Examples oleritical applications arc spindles for small ckctr motors
9 TkSILI TIST
9.1 CondItIon of test samples
Test samples shall be tested in the as-supplied condition.
When mechanical test certificates are required. test sampling shall be taken from each batch at a frequency to be agreed between purchaser and the supplier.
NOTI: Ax a uidcItnc, sampling frequencies of one sample fue a batch of steel up to 25t and two samples für a batch of steel exceeding 25t ate recommended.
9.3 Location and preparation of lest pieces
Test pieces shall be located and prcparcd as follows (sec also AS 1391):
(a) Bars up to 40 mm diameter or major cross-sectional dimension shall be tested axially. either in full section or by using a proportional lest piece.
(b) Bars with nominal cross-sectional dimensions greater than 40 mm shall have the axis of the test specimen parallel to the axis of the bar and as near as practicable to a point one-sixth of the distance between diagonally (or diametrically) opposite surfaces. A proportional lest piece shall be used.
(c) Rectangular bars of width greater than 40mm and thickness not greater than 40mm shall be tested either in full thickness or by using a proportional lest piece with its axis parallel to the axis of the product, and as near as practicable to a position one quarter of the width and one half of (he thickness from adjacent surfaces of the bar.
(dl Rectangular products of thickness greater than 40 mm shall be tested using a proportional test piece with its axis parallel to the axis of the product, and as near as practicable to a point one-sixth of the distance from a surface of the bar between opposite stmrlaees.
9.4 Method of test
The yield strength 10.2% proof stress), tensile strength and percentage elongation shall be detennmned in accordance with AS 1391.
The rate of straining when approaching the yield point shall eonflmrxn to the limits of the standard strain rate given in AS 1391.
The elongation results shall be reported on a gauge length of Lo 5.65 . So. where So is the cross-sectional area of the test piece before testing. If necessary. conversion of resLilts from a non.proportiomial gauge length shall be in accordance with ISO 2566-I.
Should any tensile test piece first selected fail to comply with the requirements of Clause 6.2. one or more of the following procedures shall be adopted:
(a) For each failed test select two ftirther test samples and test them in accordance with Clause 9. Should the Lest results from these samples comply with the requirements of Clause 6.2. the steel is deemed to comply with this Standard.
(b) Select test samples from each bar or coil and test in accordance with Clause 9. The steel is deemed to comply with this Standard if all test results comply with the requirements of Clause 6.2.